/Engine/Plugins/Experimental/Mutable/Source/MutableRuntime/Public/MuR/System.h
Invalidate and free the lastInstancedata returned by a call to BeginUpdate with the same instance index. After a call to this method, thatInstancecannot be used any more and its content is undefined.
void EndUpdate ( [Instance::ID](API\Plugins\MutableRuntime\MuR\Instance\ID) InstanceID )